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Enhanced oxygen reduction of multi-Fe3O4@carbon core-shell electrocatalysts through a nanoparticle/polymer
Jing Zhao1, Congling Li, Rui Liu
1Ministry of Education Key Laboratory of Advanced Civil Engineering Materials, School of Materials Science and Engineering and Institute for Advanced Study, Tongji University, 201804, Shanghai, China. ruiliu@tongji.edu.cn.
Abstract:
This paper reports a facile synthesis of multi-Fe3O4@carbon (mFe3O4@C) core-shell nanoparticles (NPs) using co-assembly of Fe3O4 NPs and polystyrene-b-poly(ethylene oxide) (PS-b-PEO) as a template. Slow solvent exchange leads to multiple tiny hydrophobic Fe3O4 NPs entrapped within PS-b-PEO micelles. After polydopamine coating and subsequent carbonization, a carbon shell encapsulating multiple Fe3O4 cores is obtained. The significant features of mFe3O4@C lie in the more active Fe3O4 sites and available free space within the carbon shell. As a result, the oxygen reduction performance of the resultant mFe3O4@C shows a higher onset potential than that of single Fe3O4@C. Meanwhile, mFe3O4@C exhibits a larger limiting current density (5.2 mA cm-2 at 1.0 V), long-time stability, and methanol tolerance compared to commercial Pt/C. The generality of the micellar immobilized NPs as a template is expected to boost the fabrication of various core-shell NPs for practical applications.
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